Delivery of control plane services in multi-access systems

Abstract

Methods, systems, and devices are described for wireless communications. A wireless communication system may use access preferences to indicate a preferred access for communicating signaling for a control plane service. In some aspects, an AMF and a UE may establish access preferences for one or more control plane services and communicate signaling for the control plane service based on the established access preferences. In some cases, the UE may transmit modified access preferences for a control plane service to the AMF, and the UE and AMF may communicate signaling for the control plane service based on the modified access preferences. In some aspects, an AMF may also restrict the accesses used by a control plane service. A UE may also request that certain accesses are restricted for use by a control plane service.

What is claimed is: 
     
       1. A method for wireless communication at a first network entity, comprising:
 identifying a first access via a first N1 signaling interface and a second access via a second N1 signaling interface each associated with a user equipment (UE), wherein the first N1 signaling interface is a different N1 signaling interface from the second N1 signaling interface; 
 identifying data for a control plane service associated with the UE; 
 determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is a preferred access for communicating non-access stratum (NAS) signaling for the control plane service; and 
 transmitting, to the UE, non-access stratum (NAS) signaling for the control plane service over the first access via the first N1 signaling interface or the second access via the second N1 signaling interface based at least in part on determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access. 
 
     
     
       2. The method of  claim 1 , further comprising:
 receiving, from the UE, a preference indicator for communicating the non-access stratum (NAS) signaling for the control plane service over the first access via the first N1 signaling interface, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access is based at least in part on the preference indicator. 
 
     
     
       3. The method of  claim 1 , further comprising:
 determining that the UE is in a registered state and a connected state for the first access via the first N1 signaling interface, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access is based at least in part on the UE being in the registered and the connected state for the first access via the first N1 signaling interface. 
 
     
     
       4. The method of  claim 1 , further comprising:
 determining that the UE is in an deregistered state and an unconnected state for the first access via the first N1 signaling interface and a registered state and a connected state for the second access via the second N1 signaling interface, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access is based at least in part on determining that the UE is in the deregistered state and the unconnected state for the first access via the first N1 signaling interface and the registered state and the connected state for the second access via the second N1 signaling interface, and wherein transmitting the non-access stratum (NAS) signaling for the control plane service comprises transmitting the non-access stratum (NAS) signaling for the control plane service over the second access via the second N1 signaling interface based at least in part on determining that the first access via the first N1 signaling interface is not the preferred access. 
 
     
     
       5. The method of  claim 1 , further comprising:
 selecting, for the control plane service, a first preference level of the first access via the first N1 signaling interface and a second preference level of the second access via the second N1 signaling interface based at least in part on a preference indicator indicated by the UE, subscription information for the UE, a type of the UE, a capability of the UE, a state of the UE, an origin of the data, network parameters, or any combination thereof, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access is based at least in part on selecting the first preference level and the second preference level. 
 
     
     
       6. The method of  claim 5 , further comprising:
 transmitting, to the UE, an indication of the first preference level of the first access via the first N1 signaling interface, or the second preference level of the second access via the second N1 signaling interface, or both. 
 
     
     
       7. The method of  claim 1 , wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access comprises determining that the first access via the first N1 signaling interface is the preferred access, and wherein transmitting the non-access stratum (NAS) signaling for the control plane service comprises transmitting the non-access stratum (NAS) signaling over the second access via the second N1 signaling interface based at least in part on determining that the first access via the first N1 signaling interface is the preferred access. 
     
     
       8. The method of  claim 7 , the method further comprising:
 determining that the first access via the first N1 signaling interface is unavailable for the signaling for the control plane service, wherein transmitting the non-access stratum (NAS) signaling for the control plane service comprises transmitting the non-access stratum (NAS) signaling over the second access via the second N1 signaling interface based at least in part on determining that the first access via the first N1 signaling interface is unavailable. 
 
     
     
       9. The method of  claim 1 , wherein identifying the data comprises identifying data received from a second network entity, the method further comprising:
 receiving an indicator of a preferred access type for delivering the data from the second network entity. 
 
     
     
       10. The method of  claim 9 , wherein receiving the indicator comprising:
 receiving the indicator of the preferred access type with the data for the control plane service. 
 
     
     
       11. The method of  claim 9 , wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access comprises determining that the first access via the first N1 signaling interface is of the preferred access type, the method further comprising:
 determining that the first access via the first N1 signaling interface is unavailable for the signaling for the control plane service, wherein transmitting the non-access stratum (NAS) signaling for the control plane service comprises transmitting the non-access stratum (NAS) signaling for the control plane service over the second access via the second N1 signaling interface based at least in part on determining that the first access via the first N1 signaling interface is unavailable. 
 
     
     
       12. The method of  claim 1 , further comprising:
 receiving, from the UE, a request restricting communications for the control plane service from being performed on the first access via the first N1 signaling interface; 
 overruling the request based at least in part on a network parameter, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access comprises determining that the first access via the first N1 signaling interface is preferred based at least in part on overruling the request; and 
 transmitting, to the UE, an indication that the request has been overruled, wherein transmitting the signaling for the control plane service comprises transmitting the signaling over the first access via the first N1 signaling interface based at least in part on overruling the request, wherein transmitting the signaling for the control plane service comprises transmitting the signaling over the first access via the first N1 signaling interface based at least in part on overruling the request. 
 
     
     
       13. The method of  claim 1 , wherein the control plane service is a non-protocol data unit (PDU) service. 
     
     
       14. The method of  claim 1 , further comprising:
 determining that communications for the control plane service are barred on the first access via the first N1 signaling interface; 
 transmitting, to the UE, an indication that communications for the control plane service are barred on the first access via the first N1 signaling interface, wherein determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access is based at least in part on determining that communications for the control plane service are barred on the first access via the first N1 signaling interface. 
 
     
     
       15. The method of  claim 1 , further comprising:
 receiving, from the UE, a request to renegotiate a preference level for communicating non-access stratum (NAS) signaling for the control plane service; and 
 modifying the preference level for the control plane service based at least in part on the request. 
 
     
     
       16. A method for wireless communication at a first network entity, comprising:
 identifying a first access and a second access each associated with a user equipment (UE); 
 identifying data for a control plane service associated with the UE, wherein identifying the data comprises identifying data received from a second network entity; 
 receiving an indicator of a preferred access type for delivering the data from the second network entity; 
 determining whether the first access or the second access is a preferred access for communicating signaling for the control plane service, wherein determining whether the first access or the second access is the preferred access comprises determining that the first access is of the preferred access type; 
 determining that the first access is unavailable for the signaling for the control plane service; 
 transmitting, to the second network entity, an indication that the first access is unavailable; and 
 transmitting, to the UE, signaling for the control plane service over the first access or the second access based at least in part on determining whether the first access or the second access is the preferred access. 
 
     
     
       17. A method for wireless communication at a first network entity, comprising:
 identifying a first access via a first N1 signaling interface and a second access via a second N1 signaling interface each associated with a user equipment (UE), wherein the first N1 signaling interface is a different N1 signaling interface from the second N1 signaling interface ; 
 identifying data for a control plane service associated with the UE; 
 receiving, from the UE, a request restricting communications for the control plane service from being performed on the first access; 
 determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is a preferred access for communicating signaling for the control plane service, wherein determining whether the first access or the second access is the preferred access comprises determining that the second access is the preferred access based at least in part on the request; and 
 transmitting, to the UE, signaling for the control plane service over the first access via the first N1 signaling interface or the second access via the second N1 signaling interface based at least in part on determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access, wherein transmitting the signaling for the control plane service comprises transmitting the signaling over the second access via the second N1 signaling interface based at least in part on determining that the second access via the second N1 signaling interface is preferred. 
 
     
     
       18. An apparatus for wireless communication, comprising:
 a processor; 
 memory coupled with the processor; and 
 instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
 identify a first access via a first N1 signaling interface and a second access via a second N1 signaling interface each associated with a user equipment (UE), wherein the first N1 signaling interface is a different N1 signaling interface from the second N1 signaling interface; 
 identify data for a control plane service associated with the UE; 
 determine whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is a preferred access for communicating non-access stratum (NAS) signaling for the control plane service; and 
 transmit, to the UE, non-access stratum (NAS) signaling for the control plane service over the first access via the first N1 signaling interface or the second access via the second N1 signaling interface based at least in part on determining whether the first access via the first N1 signaling interface or the second access via the second N1 signaling interface is the preferred access.